Lactic acid is formed in the muscles during exercise or running. It is

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Lactic acid is formed in the muscles during exercise or running. It is formed :

to give extra energy from fat.
to give extra oxygen from lungs.
to give extra energy from glucose.
to give extra energy from vitamins.
This question was previously asked in
UPSC CAPF – 2023
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During intense exercise, when oxygen supply to muscles may not meet the demand for aerobic respiration, muscle cells can generate ATP (energy) through anaerobic glycolysis. Glucose is broken down to pyruvate, which is then converted to lactate (lactic acid) in the absence of sufficient oxygen. This process regenerates NAD+, allowing glycolysis to continue and produce a small amount of ATP from glucose, providing extra energy when aerobic pathways are limited.
Lactic acid is produced during anaerobic respiration in muscles, which occurs when oxygen is insufficient for aerobic metabolism. This process allows glycolysis to continue, yielding ATP from glucose for energy.
Anaerobic respiration primarily uses glucose, not fat, as the substrate. Lactic acid formation happens due to a lack of sufficient oxygen supply, not to provide extra oxygen. Vitamins are not used as a direct energy source.

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